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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Assets fair value | $ 102,230 | $ 57,920
Cash equivalents | Money Market Funds |  |
Assets: |  |
Assets fair value | 33,535 | 4,847
Cash equivalents | Commercial Paper |  |
Assets: |  |
Assets fair value | 15,746 | 26,964
Cash equivalents | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 1,351 |
Short-term Investments | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 38,672 | 22,159
Short-term Investments | U.S. Government Agency Bonds |  |
Assets: |  |
Assets fair value | 4,642 |
Short-term Investments | Asset-backed securities |  |
Assets: |  |
Assets fair value | 8,284 | 3,950
Level 1 |  |
Assets: |  |
Assets fair value | 33,535 | 4,847
Level 1 | Cash equivalents | Money Market Funds |  |
Assets: |  |
Assets fair value | 33,535 | 4,847
Level 2 |  |
Assets: |  |
Assets fair value | 68,695 | 53,073
Level 2 | Cash equivalents | Commercial Paper |  |
Assets: |  |
Assets fair value | 15,746 | 26,964
Level 2 | Cash equivalents | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 1,351 |
Level 2 | Short-term Investments | Corporate Debt Securities |  |
Assets: |  |
Assets fair value | 38,672 | 22,159
Level 2 | Short-term Investments | U.S. Government Agency Bonds |  |
Assets: |  |
Assets fair value | 4,642 |
Level 2 | Short-term Investments | Asset-backed securities |  |
Assets: |  |
Assets fair value | $ 8,284 | $ 3,950

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